WO2022270028A1 - Câble à fibres optiques et procédé de fabrication de câble à fibres optiques - Google Patents

Câble à fibres optiques et procédé de fabrication de câble à fibres optiques Download PDF

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Publication number
WO2022270028A1
WO2022270028A1 PCT/JP2022/010083 JP2022010083W WO2022270028A1 WO 2022270028 A1 WO2022270028 A1 WO 2022270028A1 JP 2022010083 W JP2022010083 W JP 2022010083W WO 2022270028 A1 WO2022270028 A1 WO 2022270028A1
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WO
WIPO (PCT)
Prior art keywords
core
ripcord
sheath
optical fiber
recess
Prior art date
Application number
PCT/JP2022/010083
Other languages
English (en)
Japanese (ja)
Inventor
大輔 引間
真之介 佐藤
大樹 竹田
健 大里
Original Assignee
株式会社フジクラ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社フジクラ filed Critical 株式会社フジクラ
Priority to CA3220819A priority Critical patent/CA3220819A1/fr
Priority to CN202280012350.2A priority patent/CN116802535A/zh
Priority to AU2022296983A priority patent/AU2022296983A1/en
Priority to JP2023529534A priority patent/JPWO2022270028A1/ja
Priority to EP22827949.3A priority patent/EP4361692A1/fr
Publication of WO2022270028A1 publication Critical patent/WO2022270028A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G02B6/4432—Protective covering with fibre reinforcements
    • G02B6/4433—Double reinforcement laying in straight line with optical transmission element
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/441—Optical cables built up from sub-bundles
    • G02B6/4413—Helical structure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/4434—Central member to take up tensile loads

Definitions

  • the present invention relates to optical fiber cables and optical fiber cables. This application claims priority based on Japanese Patent Application No. 2021-103969 filed in Japan on June 23, 2021, the content of which is incorporated herein.
  • Patent Document 1 discloses an optical fiber cable that includes a core having a plurality of optical fibers, a sheath that houses the core, and a ripcord that is used to tear the sheath.
  • the rip cords are arranged in continuous spaces in the circumferential direction.
  • the ripcord can move in the circumferential direction. If the ripcord unexpectedly moves in the circumferential direction, the ripcord could entangle the core and damage the optical fiber when the user attempts to tear the sheath with the ripcord.
  • the present invention has been made in consideration of such circumstances, and an object of the present invention is to provide an optical fiber cable capable of suppressing movement of the ripcord in the circumferential direction, and a method of manufacturing the optical fiber cable.
  • an optical fiber cable provides a core having a plurality of optical fibers; A pair of tensile strength members embedded in the sheath so as to sandwich the core therebetween; and a ripcord disposed between the core and the sheath. An inwardly recessed recess is formed, and at least a portion of the ripcord is positioned inside the recess.
  • a method for manufacturing an optical fiber cable includes a core formed by wrapping a plurality of optical fibers with a pressure wrap, a ripcord, and a nipple having a core hole and a ripcord hole.
  • an optical fiber cable capable of suppressing movement of the ripcord in the circumferential direction, and a method for manufacturing the optical fiber cable.
  • FIG. 1 is a cross-sectional view of an optical fiber cable according to an embodiment of the invention
  • FIG. 2B is a cross-sectional view taken along line IIB-IIB shown in FIG. 2A
  • FIG. 2B is a cross-sectional view taken along line IIC-IIC shown in FIG. 2A
  • FIG. 2B is a cross-sectional view along the IID-IID line shown in FIG. 2A;
  • the optical fiber cable 1 includes a core 10, a sheath 20 housing the core 10, a pair of ripcords 30, and a pair of strength members 40. As shown in FIG. 1, the optical fiber cable 1 includes a core 10, a sheath 20 housing the core 10, a pair of ripcords 30, and a pair of strength members 40. As shown in FIG. 1, the optical fiber cable 1 includes a core 10, a sheath 20 housing the core 10, a pair of ripcords 30, and a pair of strength members 40. As shown in FIG.
  • the direction along the central axis O of the core 10 is called the longitudinal direction.
  • a section perpendicular to the longitudinal direction is called a transverse section.
  • a line connecting the centers of the pair of tensile members 40 in a cross-sectional view is called a neutral line L.
  • a direction along the neutral line L is called a neutral line direction X.
  • One orientation along the neutral line direction X is referred to as the +X orientation or rightward.
  • the orientation opposite to the +X orientation is referred to as the -X orientation or leftward.
  • a direction orthogonal to both the longitudinal direction and the neutral line direction X is called a vertical direction Y.
  • One orientation along the vertical direction Y is referred to as the +Y orientation or up.
  • the orientation opposite to the +Y orientation is referred to as the -Y orientation or down.
  • the direction intersecting the central axis O is called the radial direction
  • the direction rotating around the central axis O is called the circumferential direction.
  • the direction approaching the central axis O is called the radial inner side
  • the direction away from the central axis O is called the radial outer side.
  • the core 10 has a plurality of optical fibers 11 and a wrapping member 12 that wraps the plurality of optical fibers 11 .
  • the shape of the core 10 of the present embodiment is substantially circular in cross-sectional view, except for a portion in which a concave portion 12a (described later) is formed. It should be noted that the "substantially circular shape" also includes cases where it can be regarded as a circular shape if manufacturing errors are eliminated.
  • an optical fiber core wire, an optical fiber bare wire, an optical fiber tape core wire, or the like can be used.
  • the plurality of optical fibers 11 may form a so-called intermittently fixed ribbon.
  • the intermittent fixing tape core wire the plurality of optical fibers 11 are arranged in the arrangement direction perpendicular to the longitudinal direction.
  • Each two optical fibers 11 adjacent in the arrangement direction are connected to each other by a plurality of connecting portions arranged intermittently in the longitudinal direction.
  • the positions in the longitudinal direction of each two connecting portions adjacent in the arrangement direction are different from each other.
  • the mode of the optical fiber 11 included in the core 10 is not limited to the intermittently fixed tape core wire, and can be changed as appropriate.
  • the pressure wrap 12 may be a tape (sheet) that is laterally wound around the plurality of optical fibers 11 .
  • the pressure wrap 12 may be a tape (sheet) wound around the plurality of optical fibers 11 in an SZ shape or a spiral shape.
  • the pressure wrap 12 may be a tape (sheet) wound longitudinally around the plurality of optical fibers 11 .
  • the press wrap 12 (tape, sheet) can be, for example, nonwoven fabric, polyester tape, or the like.
  • a water-absorbing tape obtained by imparting water-absorbing properties to a non-woven fabric, polyester tape, or the like may be used. In this case, the waterproof performance of the optical fiber cable 1 can be enhanced.
  • the wrap 12 may be a seamlessly formed tube (protective layer).
  • the material forming the pressure wrap 12 (tube) includes, for example, polyethylene (PE), polypropylene (PP), ethylene ethyl acrylate copolymer (EEA), ethylene vinyl acetate copolymer (EVA), and ethylene propylene.
  • Polyolefin (PO) resins such as copolymers (EP), polyvinyl chloride (PVC), and the like can be used.
  • the pressure winding 12 (tube) may be formed using a mixture (alloy, mixture) of the above resins.
  • a concave portion 12a is formed in at least a portion of the outer peripheral surface of the presser wrap 12 .
  • the presser wrap 12 is bent radially inward at the recess 12a. More specifically, the outer peripheral surface of the presser wrap 12 is recessed radially inward at the recess 12a. The inner peripheral surface of the presser wrap 12 protrudes radially inward at the recess 12a.
  • two recesses 12a are formed.
  • One ripcord 30 is arranged inside each recess 12a. The recess 12a is formed by pressing the ripcord 30 against the core 10, for example.
  • the thickness (dimension in the radial direction) of the pressing wrap 12 may be smaller than the outer diameter of the ripcord 30 .
  • Materials for the sheath 20 include polyolefins (PO) such as polyethylene (PE), polypropylene (PP), ethylene ethyl acrylate copolymer (EEA), ethylene vinyl acetate copolymer (EVA), ethylene propylene copolymer (EP) ) resin, polyvinyl chloride (PVC), etc. can be used.
  • PO polyolefins
  • PE polyethylene
  • PP polypropylene
  • EOA ethylene ethyl acrylate copolymer
  • EVA ethylene vinyl acetate copolymer
  • EP ethylene propylene copolymer
  • the sheath 20 may be formed using a mixture (alloy, mixture) of the above resins.
  • the right tensile member 40 may be referred to as a first tensile member 40A
  • the left tensile member 40 may be referred to as a second tensile member 40B.
  • a pair of tensile members 40 are embedded in the sheath 20 so as to position the core 10 therebetween in the neutral line direction X. As shown in FIG. Each tensile strength member 40 extends linearly along the longitudinal direction. The strength member 40 has a higher spring constant or tensile strength in the longitudinal direction than the sheath 20 .
  • the material of the tensile strength member 40 for example, metal wire (steel wire, etc.), fiber reinforced plastic (FRP), or the like can be used.
  • the tensile strength member 40 is FRP, for example, aramid fiber, glass fiber, or the like can be used as the fiber to be stepped on by FRP.
  • the tensile strength member 40 has a role of receiving the tension and protecting the optical fiber 11 when the tension along the longitudinal direction is applied to the optical fiber cable 1 . Since the tensile member 40 is hard to expand and contract in the longitudinal direction, the optical fiber cable 1 is hard to bend in the neutral line direction X. On the other hand, the fiber optic cable 1 tends to bend in the vertical direction Y perpendicular to the neutral line direction X. As shown in FIG.
  • the right ripcord 30 may be referred to as a first ripcord 30A
  • the left ripcord 30 may be referred to as a second ripcord 30B.
  • Each rip cord 30 of the present embodiment is positioned within a range of -45° to +45° around the central axis O with the neutral line L as a reference in a cross-sectional view.
  • Each ripcord 30 radially overlaps one of the pair of strength members 40 . That is, the first ripcord 30A and the first tensile strength member 40A overlap in the radial direction.
  • the second ripcord 30B and the second strength member 40B overlap in the radial direction. In the example of FIG.
  • each ripcord 30 is arranged so as to sandwich the core 10 in the neutral line direction X. As shown in FIG. That is, each rip cord 30 is arranged at a position of 0° around the central axis O with the neutral line L as a reference. Each ripcord 30 extends linearly along the longitudinal direction.
  • Each ripcord 30 is disposed radially between the core 10 and the sheath 20 . More specifically, at least a portion of each ripcord 30 is located within two recesses 12a of core 10 . An entirety of one of the two ripcords 30 may be housed within the recess 12a. Both of the two ripcords may be wholly housed within the two recesses 12a. Alternatively, both of the two ripcords 30 may protrude radially outward from the two recesses 12a.
  • one recessed portion 12a located on the right side may be referred to as a first recessed portion 12aA
  • the other recessed portion 12a located on the left side may be referred to as a second recessed portion 12aB.
  • two gaps G are formed between the core 10 and the sheath 20 .
  • One of the two gaps G is a space surrounded by the first concave portion 12 aA and the inner surface of the sheath 20 .
  • the other of the two gaps G is a space surrounded by the second recess 12 aB and the inner surface of the sheath 20 .
  • the dimension of the gap G in the radial direction is shorter than the dimension of the gap G in the circumferential direction.
  • the ripcord 30 is sandwiched between the core 10 and the sheath 20 in the gap G. Note that the dimensions of the gap G in the radial direction and the circumferential direction can be changed as appropriate.
  • the ripcord 30 is used to tear the sheath 20.
  • the user holds the ripcord 30 and bends the ripcord 30 radially outward. Therefore, it is desirable that the ripcord 30 be made of a flexible material.
  • the ripcord 30 is made of a material that is less likely to be deformed or broken due to stress when the sheath 20 is torn. That is, the ripcord 30 is made of a material having a high Young's modulus and a high breaking strength. Also, the thickness (diameter) of the ripcord 30 can be designed according to the object (member) to be torn by the ripcord 30 .
  • the Young's modulus of the ripcord 30 is 300 kgf/mm2 or less.
  • a ripcord 30 having a Young's modulus of 140 to 180 kgf/mm2 is particularly suitable.
  • the rip cord 30 for example, a synthetic fiber (polyester or the like) thread or the like can be used.
  • a cylindrical rod made of polypropylene (PP) or nylon may be used.
  • Each of the nipple 50 and the die 60 is a tubular part.
  • the die 60 is arranged to surround at least a portion of the nipple 50 from the radial outside.
  • a radial gap is provided between the nipple 50 and the die 60 .
  • Nipple 50 and die 60 are arranged such that their central axes substantially coincide with each other. It should be noted that “substantially coincident” also includes the case where both central axes can be regarded as coincident if an error at the time of arrangement is eliminated.
  • the direction along the central axes of the nipple 50 and the die 60 is called an extrusion direction Z. As shown in FIG. In the drawings, the downstream side (one side) in the extrusion direction Z is indicated as the +Z side, and the upstream side (the other side) is indicated as the -Z side. Note that the extrusion direction Z substantially coincides with the longitudinal direction described above.
  • the core 10, the ripcord 30, and the tensile member 40 are pushed out downstream while the sheath 20 is extruded downstream (extrusion process). .
  • the nipple 50 has a core hole 52 located in the center in the radial direction and a peripheral wall 51 surrounding the core hole 52 .
  • the inner diameter of the core hole 52 is substantially constant along the extrusion direction Z. It should be noted that “substantially constant” includes the case where it can be regarded as being constant along the extrusion direction Z if manufacturing errors are eliminated.
  • the core hole 52 is a portion through which the core 10 is inserted during the extrusion process. The inner diameter of the core hole 52 may not be substantially constant along the extrusion direction Z.
  • the outer diameter of the peripheral wall 51 changes along the extrusion direction Z. More specifically, the outer diameter at the upstream end (-Z side end) of the peripheral wall 51 is larger than the outer diameter at the downstream end (+Z side end) of the peripheral wall 51 . At an intermediate portion of the peripheral wall 51 in the extrusion direction Z, the outer diameter of the peripheral wall 51 decreases toward the downstream side.
  • the outer peripheral surface of the peripheral wall 51 includes the tapered surface S1.
  • the inner peripheral surface of the die 60 is provided with a tapered surface S2.
  • the gap between the tapered surface S1 and the tapered surface S2 is constant along the extrusion direction Z.
  • a pair of ripcord holes 53 and a pair of strength member holes 54 are formed in the peripheral wall 51 .
  • Each ripcord hole 53 extends linearly from the upstream end ( ⁇ Z side end) of the peripheral wall 51 toward the downstream side, and extends radially inward at an intermediate portion of the nipple 50 in the extrusion direction Z. It bends and communicates with the core hole 52 .
  • the ripcord hole 53 is a hole through which the ripcord 30 is inserted.
  • Each tensile strength member hole 54 extends along the extrusion direction Z so as to maintain a constant distance from the outer peripheral surface of the peripheral wall 51 .
  • Each tensile strength member hole 54 is open to the downstream end face and the upstream end face of the peripheral wall 51 .
  • Each strength member hole 54 communicates with the interior space of the die 60 at the downstream end of the nipple 50 .
  • the strength member hole 54 is a hole through which the strength member 40 is inserted.
  • the core 10 in which the plurality of optical fibers 11 are wrapped with the pressure wrap 12 is inserted through the core hole 52 of the nipple 50 and pushed out toward the downstream side.
  • the step of pressing and winding the plurality of optical fibers 11 with the pressing winding 12 may be performed in advance.
  • the plurality of optical fibers 11 may be twisted in an SZ shape or a spiral shape inside the pressure winding 12 .
  • FIG. 2B is a cross-sectional view of the optical fiber cable manufacturing apparatus at the point where the members 10, 30, 40 described above are inserted into the respective holes 52, 53, 54.
  • each ripcord hole 53 communicates with the core hole 52 , the ripcord 30 passing through each ripcord hole 53 merges with the core 10 at the core hole 52 . At this time, each ripcord 30 is radially pressed against the core 10 . As a result, the core 10 is formed with two recesses 12a that are recessed radially inward. Further, each ripcord 30 is introduced one by one inside the two recesses 12a. In a cross-sectional view, the entire ripcord 30 may be positioned inside the recess 12a, or part of the ripcord 30 may protrude radially outward from the recess 12a.
  • FIG. 2C is a cross-sectional view of the optical fiber cable manufacturing apparatus at the point described above.
  • FIG. 2D is a cross-sectional view of the optical fiber cable manufacturing apparatus 2 at the point described above.
  • the point where strength member 40 joins sheath 20 is located downstream of the point where ripcord 30 joins core 10 .
  • the point where the tensile member 40 joins the sheath 20 may be located upstream from the point where the ripcord 30 joins the core 10 .
  • the positions in the extrusion direction Z of the two points may be the same.
  • the sheath 20 merges with the core 10 in the internal space of the die 60 .
  • the molding of the optical fiber cable 1 is completed.
  • the shape of the sheath 20 may be properly arranged in the internal space of the die 60 .
  • the ripcord 30 of this embodiment is arranged inside the concave portion 12a formed in the presser wrap 12 .
  • the movement of the ripcord 30 in the circumferential direction is suppressed as compared with, for example, the case where the presser wrap 12 is not formed with the recessed portion 12a.
  • the ripcord 30 of this embodiment is sandwiched between the core 10 and the sheath 20, movement of the ripcord 30 in the circumferential direction is more effectively suppressed.
  • the optical fiber cable 1 is hard to bend in the neutral line direction X and easy to bend in the vertical direction Y.
  • the ripcord 30 were arranged so as to sandwich the core 10 in the vertical direction Y, when the optical fiber cable 1 was bent in the vertical direction Y, the ripcord would be separated between the core 10 and the sheath 20 . 30 are compressed. At this time, since the core 10 is pressed by the ripcord 30, lateral pressure acts on the optical fiber 11, and the transmission loss of the optical fiber cable 1 may increase.
  • the ripcord 30 of the present embodiment is positioned within a range of -45° to +45° around the central axis O with the neutral line L as a reference in a cross-sectional view.
  • the ripcord 30 radially overlaps the strength member 40 .
  • the ripcord 30 does not face the core 10 in the vertical direction Y. Therefore, it is possible to prevent the ripcord 30 from pressing the core 10 and exerting lateral pressure on the optical fiber 11 , thereby suppressing an increase in transmission loss of the optical fiber cable 1 .
  • the ripcord 30 is arranged inside the gap G surrounded by the recess 12 a of the core 10 and the sheath 20 .
  • the user can grasp the ripcord 30 and shift the ripcord 30 in the circumferential direction. This allows the user to tear the sheath 20 using the ripcord 30 even when the ripcord 30 radially overlaps the tension member 40 .
  • the concave portion 12a of the pressure wrap 12 protrudes radially inward, the concave portion 12a bites into the plurality of optical fibers 11 and serves as a wedge. This suppresses the plurality of optical fibers 11 from being displaced in the longitudinal direction inside the core 10 as compared with the case where the recess 12a is not formed in the pressure wrap 12, for example.
  • the plurality of optical fibers 11 are twisted inside the pressure winding 12, the plurality of optical fibers 11 are less likely to be untwisted.
  • the presser wrap 12 has water absorbability, if the presser wrap 12 is formed with the recessed portion 12a, the presser wrap 12 and the central axis O of the core 10 come close to each other, and the presser wrap 12 is aligned with the central axis O of the core 10. Water can be efficiently absorbed from the vicinity. Therefore, the waterproof performance of the optical fiber cable 1 can be improved, for example, compared to the case where the recess 12a is not formed in the pressure wrap 12 .
  • the optical fiber cable 1 includes a core 10 having a plurality of optical fibers 11 and a pressure wrap 12 that wraps the plurality of optical fibers 11, and a sheath 20 that accommodates the core 10. , and a ripcord 30 disposed between the core 10 and the sheath 20, the pressure wrap 12 is formed with a recess 12a that is recessed radially inward, and at least a portion of the ripcord 30 is formed in the recess 12a. located within. This configuration restrains movement of the ripcord 30 in the circumferential direction.
  • a pair of tensile members 40 are embedded in the sheath 20 so as to position the core 10 therebetween. is located within the range of -45° to +45°. This configuration prevents lateral pressure from acting on the optical fiber 11 in the core 10 due to the ripcord 30 , thereby suppressing an increase in transmission loss of the optical fiber cable 1 .
  • a pair of tensile members 40 embedded in the sheath 20 are further provided so as to position the core 10 therebetween, and a gap G surrounded by the recess 12a and the sheath 20 is formed between the core 10 and the sheath 20.
  • the dimension of the gap G in the radial direction is shorter than the dimension of the gap G in the circumferential direction. 40 radially overlapping at least one of them.
  • the method for manufacturing an optical fiber cable has a core 10 formed by wrapping a plurality of optical fibers 11 with a pressure wrap 12, a ripcord 30, a core hole 52 and a ripcord hole 53.
  • the nipple 50 is prepared, the core 10 is inserted through the core hole 52 and pushed out, and the ripcord 30 is inserted through the ripcord hole 53 and pushed out.
  • the ripcord 30 passing through the ripcord hole 53 is introduced into the recess 12a inside the core hole 52 while forming the recess 12a recessed inward. According to this configuration, it is possible to manufacture the optical fiber cable 1 capable of suppressing the movement of the ripcord 30 in the circumferential direction.
  • Each fiber optic cable included a core of 288 optical fibers wrapped in a restraint wrap, a sheath, a pair of strength members, and a pair of ripcords.
  • the only difference between the optical fiber cables was the shape (depth) of the recess formed in the pressure wrap, and the other configurations were the same between the optical fiber cables.
  • the recess was not formed in the pressure winding.
  • Table 1 below shows the results of checking the untwisting prevention performance, the waterproof performance, the wire drawing resistance, and the transmission loss for each of the comparative example and Examples 1 to 3.
  • the manufactured optical fiber cable was dismantled. When the twist of the optical fiber was maintained, it was evaluated as "OK”, and when it was not maintained, it was evaluated as "NG”. Confirmation of waterproof performance was performed under predetermined conditions according to IEC 60794-1-22 F5B. If the water running length was less than or equal to the predetermined distance, it was evaluated as "OK”, and if it exceeded the predetermined distance, it was evaluated as "NG".
  • a pull-out force was applied to a plurality of optical fibers included in each cable.
  • the magnitude of the pulling force required to move the plurality of optical fibers exceeded a predetermined value, it was evaluated as "OK”, and when it was less than the predetermined value, it was evaluated as "NG”.
  • the transmission loss at a predetermined wavelength was measured by an OTDR (Optical Time Domain Reflectometer). When the measured value was less than or equal to the predetermined value, it was evaluated as "OK”, and when it exceeded the predetermined value, it was evaluated as "NG”.
  • the optical fiber cables with a concavity C of 10 to 30% exhibited good performance in terms of anti-twisting performance, waterproof performance, resistance to core wire pull-out, and transmission loss. Therefore, by forming a concave portion in the pressure wrap and setting the concave ratio C within the range of 10 to 30%, the practicality of the optical fiber cable can be enhanced.
  • the shape of the core 10 may be substantially elliptical in cross-sectional view, except for the portion where the recess 12a is formed. It should be noted that the term “substantially elliptical” also includes the case where it can be regarded as elliptical in a cross-sectional view if manufacturing errors are eliminated. In this case, the concave portion 12 a of the presser wrap 12 may be positioned on the long axis of the core 10 . Since the core 10 is elliptical in cross-sectional view, the optical fiber cable 1 is less likely to bend in the direction in which the long axis of the core 10 extends.
  • the optical fiber cable 1 is less likely to bend in the direction in which the pair of ripcords 30A and 30B (two recesses 12aA and 12aB) are aligned. This further suppresses the ripcord 30 from pressing the core 10 and exerting lateral pressure on the optical fiber 11 .
  • the optical fiber cable 1 is less likely to bend due to the direction in which the pair of ripcords 30 are arranged (neutral line direction X). .
  • lateral pressure acting on the optical fiber 11 due to the ripcord 30 pressing against the core 10 is more reliably suppressed.
  • the phrase "the direction in which the pair of ripcords 30 are arranged substantially coincides with the neutral line direction X" more specifically means that the ripcord 30 rotates around the central axis O with the neutral line L as a reference in a cross-sectional view. is located within the range of -45° to +45°.
  • the core 10 is substantially elliptical as described above and the plurality of optical fibers 11 are twisted inside the restraining wrap 12, for example, when the core 10 is circular in cross-sectional view, , the plurality of optical fibers 11 are less likely to untwist.
  • the shape of the portion of the core 10 excluding the portion where the recess 12a is formed can be estimated as follows, for example. First, three points are selected at approximately equal intervals in the circumferential direction from a portion of the outline (periphery) of the core 10 other than the concave portion 12a. Next, create a virtual circle passing through the selected three points.
  • the virtual circle can be created using, for example, the three-point circle creation function of a digital microscope (VHX-6000) manufactured by Keyence Corporation. Next, by comparing the created virtual circle with the contour of the actual core 10, it can be determined whether the shape of the core 10 is an ellipse. Further, it can be estimated that the direction in which the outline of the core 10 protrudes outside the virtual circle is the long axis, and the direction in which the outline of the core 10 is positioned inside the virtual circle is the short axis.
  • the number of rip cords 30 and tensile members 40 can be changed as appropriate.
  • Each of the ripcords 30 and the strength members 40 may be any number of one or more.
  • the optical fiber cable 1 does not have to be provided with the tension members 40 .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Insulated Conductors (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Surface Treatment Of Glass Fibres Or Filaments (AREA)

Abstract

L'invention concerne un câble à fibres optiques comprenant une âme, une gaine qui loge l'âme, et un cordon de déchirure qui est disposé entre l'âme et la gaine. L'âme a une pluralité de fibres optiques, et une bande d'enveloppement à la presse qui enveloppe la pluralité de fibres optiques. Dans la bande d'enveloppement à la presse, un évidement en retrait vers l'intérieur dans la direction radiale de l'âme est formé. Au moins une partie du cordon de déchirure est située à l'intérieur de l'évidement.
PCT/JP2022/010083 2021-06-23 2022-03-08 Câble à fibres optiques et procédé de fabrication de câble à fibres optiques WO2022270028A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CA3220819A CA3220819A1 (fr) 2021-06-23 2022-03-08 Cable a fibres optiques et methode de fabrication
CN202280012350.2A CN116802535A (zh) 2021-06-23 2022-03-08 光纤线缆以及光纤线缆的制造方法
AU2022296983A AU2022296983A1 (en) 2021-06-23 2022-03-08 Optical fiber cable and method of manufacturing optical fiber cable
JP2023529534A JPWO2022270028A1 (fr) 2021-06-23 2022-03-08
EP22827949.3A EP4361692A1 (fr) 2021-06-23 2022-03-08 Câble à fibres optiques et procédé de fabrication de câble à fibres optiques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-103969 2021-06-23
JP2021103969 2021-06-23

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WO2022270028A1 true WO2022270028A1 (fr) 2022-12-29

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JPH04119411U (ja) * 1991-04-03 1992-10-26 藤倉電線株式会社 光フアイバケーブル
JPH08220395A (ja) * 1995-02-16 1996-08-30 Fujikura Ltd 光ファイバケーブル
JPH10104475A (ja) * 1996-09-26 1998-04-24 Furukawa Electric Co Ltd:The 光ファイバ送通用パイプ
JP2004029382A (ja) * 2002-06-26 2004-01-29 Mitsubishi Cable Ind Ltd 移動用ケーブル
JP2006514333A (ja) * 2003-02-25 2006-04-27 エルエス ケーブル リミテッド ルースチューブ型光ケーブル
JP2015169756A (ja) * 2014-03-06 2015-09-28 株式会社フジクラ 光ケーブル
JP6134365B2 (ja) 2015-10-09 2017-05-24 株式会社フジクラ 光ファイバケーブル
US20170343752A1 (en) * 2016-05-26 2017-11-30 Corning Optical Communications LLC Optical fiber cable with elongate strength member recessed in armor layer
JP2021103969A (ja) 2019-12-26 2021-07-26 井関農機株式会社 移植機

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04119411U (ja) * 1991-04-03 1992-10-26 藤倉電線株式会社 光フアイバケーブル
JPH08220395A (ja) * 1995-02-16 1996-08-30 Fujikura Ltd 光ファイバケーブル
JPH10104475A (ja) * 1996-09-26 1998-04-24 Furukawa Electric Co Ltd:The 光ファイバ送通用パイプ
JP2004029382A (ja) * 2002-06-26 2004-01-29 Mitsubishi Cable Ind Ltd 移動用ケーブル
JP2006514333A (ja) * 2003-02-25 2006-04-27 エルエス ケーブル リミテッド ルースチューブ型光ケーブル
JP2015169756A (ja) * 2014-03-06 2015-09-28 株式会社フジクラ 光ケーブル
JP6134365B2 (ja) 2015-10-09 2017-05-24 株式会社フジクラ 光ファイバケーブル
US20170343752A1 (en) * 2016-05-26 2017-11-30 Corning Optical Communications LLC Optical fiber cable with elongate strength member recessed in armor layer
JP2021103969A (ja) 2019-12-26 2021-07-26 井関農機株式会社 移植機

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CA3220819A1 (fr) 2022-12-29
AU2022296983A1 (en) 2023-12-14

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